gstreamer/test/mp1parse.c

#include <gst/gst.h>

extern gboolean _gst_plugin_spew;

void eof(GstSrc *src) {
  g_print("have eos, quitting\n");
  exit(0);
}

void mp1parse_info_chain(GstPad *pad,GstBuffer *buf) {
  //g_print("sink : got buffer of size %d\n",GST_BUFFER_SIZE(buf));
  gst_buffer_unref(buf);
}

void new_pad_created(GstElement *parse,GstPad *pad,GstElement *pipeline) {
  GstElement *parse_audio, *parse_video, *decode, *decode_video, *play;
  GstElement *audio_queue, *video_queue;
  GstElement *audio_thread, *video_thread;
  GstPad *infopad;

  g_print("***** a new pad %s was created\n", gst_pad_get_name(pad));

  // connect to audio pad
  if (strncmp(gst_pad_get_name(pad), "audio_", 6) == 0) {
    // construct internal pipeline elements
    parse_audio = gst_elementfactory_make("mp3parse","parse_audio");
    g_return_if_fail(parse_audio != NULL);
    decode = gst_elementfactory_make("mpg123","decode_audio");
    g_return_if_fail(decode != NULL);
    play = gst_elementfactory_make("audiosink","play_audio");
    g_return_if_fail(play != NULL);

    // create the thread and pack stuff into it
    audio_thread = gst_thread_new("audio_thread");
    g_return_if_fail(audio_thread != NULL);
    gst_bin_add(GST_BIN(audio_thread),GST_ELEMENT(parse_audio));
    gst_bin_add(GST_BIN(audio_thread),GST_ELEMENT(decode));
    gst_bin_add(GST_BIN(audio_thread),GST_ELEMENT(play));

    // set up pad connections
    gst_element_add_ghost_pad(GST_ELEMENT(audio_thread),
                              gst_element_get_pad(parse_audio,"sink"));
    gst_pad_connect(gst_element_get_pad(parse_audio,"src"),
                    gst_element_get_pad(decode,"sink"));
    gst_pad_connect(gst_element_get_pad(decode,"src"),
                    gst_element_get_pad(play,"sink"));

    // construct queue and connect everything in the main pipelie
    audio_queue = gst_elementfactory_make("queue","audio_queue");
    gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(audio_queue));
    gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(audio_thread));
    gst_pad_connect(pad,
                    gst_element_get_pad(audio_queue,"sink"));
    gst_pad_connect(gst_element_get_pad(audio_queue,"src"),
                    gst_element_get_pad(audio_thread,"sink"));

    // set up thread state and kick things off
    gtk_object_set(GTK_OBJECT(audio_thread),"create_thread",TRUE,NULL);
    g_print("setting to RUNNING state\n");
    gst_element_set_state(GST_ELEMENT(audio_thread),GST_STATE_RUNNING);
    g_print("setting to PLAYING state\n");
    gst_element_set_state(GST_ELEMENT(audio_thread),GST_STATE_PLAYING);
  } else if (strncmp(gst_pad_get_name(pad), "video_", 6) == 0) {
    infopad = gst_pad_new("sink",GST_PAD_SINK);
    gst_pad_set_chain_function(infopad,mp1parse_info_chain);

    // construct internal pipeline elements
    parse_video = gst_elementfactory_make("mp1videoparse","parse_video");
    g_return_if_fail(parse_video != NULL);
    decode = gst_elementfactory_make("mpeg_play","decode_video");
    g_return_if_fail(decode_video != NULL);

    // create the thread and pack stuff into it
    video_thread = gst_thread_new("video_thread");
    g_return_if_fail(video_thread != NULL);
    gst_bin_add(GST_BIN(video_thread),GST_ELEMENT(parse_video));
    gst_bin_add(GST_BIN(video_thread),GST_ELEMENT(decode));

    // set up pad connections
    gst_element_add_ghost_pad(GST_ELEMENT(video_thread),
                              gst_element_get_pad(parse_video,"sink"));
    gst_pad_connect(gst_element_get_pad(parse_video,"src"),
                    gst_element_get_pad(decode,"sink"));
    gst_pad_connect(gst_element_get_pad(decode,"src"),
                    infopad);

    // construct queue and connect everything in the main pipeline
    video_queue = gst_elementfactory_make("queue","video_queue");
    gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(video_queue));
    gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(video_thread));
    gst_pad_connect(pad,
                    gst_element_get_pad(video_queue,"sink"));
    gst_pad_connect(gst_element_get_pad(video_queue,"src"),
                    gst_element_get_pad(video_thread,"sink"));

    // set up thread state and kick things off
    gtk_object_set(GTK_OBJECT(video_thread),"create_thread",TRUE,NULL);
    g_print("setting to RUNNING state\n");
    gst_element_set_state(GST_ELEMENT(video_thread),GST_STATE_RUNNING);
    g_print("setting to PLAYING state\n");
    gst_element_set_state(GST_ELEMENT(video_thread),GST_STATE_PLAYING);
  }
  g_print("\n");
}

int main(int argc,char *argv[]) {
  GstPipeline *pipeline;
  GstElement *src, *parse;

  g_print("have %d args\n",argc);

  _gst_plugin_spew = TRUE;
  gst_init(&argc,&argv);
  gst_plugin_load_all();

  pipeline = gst_pipeline_new("pipeline");
  g_return_if_fail(pipeline != NULL);

  src = gst_elementfactory_make("disksrc","src");
  g_return_if_fail(src != NULL);
  gtk_object_set(GTK_OBJECT(src),"location",argv[1],NULL);
  g_print("should be using file '%s'\n",argv[1]);

  parse = gst_elementfactory_make("mpeg1parse","parse");
  g_return_if_fail(parse != NULL);

  gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(src));
  gst_bin_add(GST_BIN(pipeline),GST_ELEMENT(parse));

  gtk_signal_connect(GTK_OBJECT(parse),"new_pad",
                      GTK_SIGNAL_FUNC(new_pad_created),pipeline);

  gtk_signal_connect(GTK_OBJECT(src),"eos",
                      GTK_SIGNAL_FUNC(eof),NULL);

  gst_pad_connect(gst_element_get_pad(src,"src"),
                  gst_element_get_pad(parse,"sink"));

  g_print("setting to RUNNING state\n");
  gst_element_set_state(GST_ELEMENT(pipeline),GST_STATE_RUNNING);

  xmlSaveFile("mp1parse.xml",gst_xml_write(GST_ELEMENT(pipeline)));

  g_print("about to enter loop\n");
  while (1)
    gst_src_push(GST_SRC(src));
}